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Can anyone offer any advice on a total mystery pressure loss on a Vaillant Eco Pro 28 combi boiler? Here's the background:
Almost total pressure loss every 1-2 hours. Apparently the equivalent of several pints of water each time
When pressure is up, heating and hot water functioning fine, so flame and water/heat switch fine. PRV also working fine. No water inside boiler chamber anywhere
Expansion chamber has been replaced: no change in problem
Isolator valves fitted to heating in/out pipes, so when isolated, the boiler does not lose pressure (indicating a leak elsewehre therefore?)
BUT: Professional leak detection not found any evidence of leak over course of 2 days monitoring (8 hours each). Including CCTV investigation, thermal imaging. Gas tracing so far ineffective as some pipes are in a void underneath suspended floor
Have we missed trying any other angle? All the professionals are stumped (3 separate gas engineers and 1 professional leak tracer) Cheers!
Almost total pressure loss every 1-2 hours. Apparently the equivalent of several pints of water each time
When pressure is up, heating and hot water functioning fine, so flame and water/heat switch fine. PRV also working fine. No water inside boiler chamber anywhere
Expansion chamber has been replaced: no change in problem
Isolator valves fitted to heating in/out pipes, so when isolated, the boiler does not lose pressure (indicating a leak elsewehre therefore?)
BUT: Professional leak detection not found any evidence of leak over course of 2 days monitoring (8 hours each). Including CCTV investigation, thermal imaging. Gas tracing so far ineffective as some pipes are in a void underneath suspended floor
Have we missed trying any other angle? All the professionals are stumped (3 separate gas engineers and 1 professional leak tracer) Cheers!